Spanish Fiscal Identity Number consists of eight digits followed by a check letter for Spanish people with DNI, or a letter, seven digits and a check letter for the rest of individuals.
That is, all the letters from A to Z except I, O and U. Letters I and O are not used to avoid confusion with the numbers 1 and 0, and U is not used so that the total number of letters is 23, which is a prime number and better suited to calculate the check letter.
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